| 摘要 |
Detection of whether or not liquid or a liquid droplet (ink) has passed is realized without contacting the passing liquid or liquid droplet, by providing a radiated-wave detector, arranged near the liquid or liquid droplet, for detecting an infrared ray radiated from the passing liquid or liquid droplet, and a detector for detecting variation of an output value of the radiated-wave detector. Furthermore, the variation of an output value detected by the detector is integrated to obtain the variation amount of the output values, thereby obtaining the amount of liquid or liquid droplet (ink) passed. With the use of the foregoing configuration, further provided is an ink-jet printing apparatus which can accurately determine whether or not ink has been discharged by a printhead and which can measure the amount of ink discharged without contacting the ink, and an ink detection method for the ink-jet printing apparatus.
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